A spring hinge actuated by torsion springs has torque factors, requiring accurate evaluation of the pressures, degree of travel, frequency of use, projected life expectancy, atmospheric conditions and other conditions which may affect its operation.

This type of hinge reaches its maximum tension at a given point and maintains this pressure (except for slight spring set) during its cycling term.

Spring hinges, loaded to the open position, have a free position (in which the spring is relaxed) and the degree where full pressure is reached.  As illustrated.

Generally, a hinge, spring loaded to the closed position, is under tension in all degrees of travel.  A hinge of this type may have embossed leaves to allow the spring legs freedom of movement in any method of attachment, as shown here.

All torsion springs have limiting factors, based primarily upon the gauge of the spring wire in relation to the inside diameter to which it is wound.  There are a few spring hinges which are in general use but most applications demand a hinge specifically constructed.

Established guidelines for the development of spring hinge design are basic, but do not offer the latitude for the peculiar requirments usually encountered.  Our services are available in this area.